The Superior Vena Cava is a large vein in the human body that carries deoxygenated blood from the upper half of the body back to the heart. It collects blood from areas such as the head, neck, arms, and upper chest. This vein is crucial for returning blood to the right atrium of the heart, where it can then be sent to the lungs for oxygenation. The Superior Vena Cava is one of two main veins that return blood to the heart, the other being the Inferior Vena Cava, which drains blood from the lower body. Any obstruction or blockage in the Superior Vena Cava can lead to serious health issues, including swelling and increased pressure in the veins of the head and neck.